I installed these in a Macht Schnell ashtray gauge pod (not included) and made up a wire harness that plugs straight in to the ash tray connector. Installation is very simple.
I bought these new in November from the Aus distributor, AEM have a good reputation fro quality. I paid $577 for the setup including all the senders and wire harnesses. Although in, they were never hooked up and I've since changed for a different style.
Happy to help with how to install, it's very simple. PM me for details or any other info